Under the hood fgrab has a highly sophisticated capture engine. fgrab is about 70 faster than the leading screen movie capture utility Snapz Pro X 2. On a MacBook Pro 1.83 GHz fgrab needs about 20 of the CPU processing power to capture the whole screen (1440 × 900 px @ 30 fps). If only a special area of the screen is in motion (that is the normal case), fgrab merely needs 5% or less. fgrab only captures the screen areas that change.